As the nearest I have ever been to a battle is being part of a gun crew on a 5.5" howitzer, and firing an SLR and submachine gun while in the British Territorial army, I would find it difficult to judge what is realistic and what is not in battle. However, I do understand that veterans have considered Saving Private Ryan to be realistic of combat at that time. i have not seen the film aas it is, to me, too much how 'Uncle Sam' won the war.
I was thinking more in terms of, for example, the absence of the bridge at Stirling in Braveheart and Sir Tom fairfax leading a parliamentarian cavalry charge at Edgehill when he was not present.